eCCPM Raptor Conversions

[mike557]

Getting back to the topic and playing devil's addvocat. Is'int interaction inevetable as flying loads up the servos.
2 The claim for weight saving is insignificant as you are still using three servos
Mr Taya heli designer has publicaly stated in an interview (Model helicopter World) That eccpm is a result of not being able to design a real control system. As a engineer myself I have yet to see any reason to disagree with someone with more talant than myself :lol: :lol: :lol:

[TC]

This is my 1st eCCPM machine so I can't answer your question on servo loads as I have not flown it yet, but I will say that's the 1st time I've heard that point.

I don't think the weight saving is a great deal, I think it has more to do with the fact that there are less moving parts as opposed to the amount of servo's.

When mine is finished I will weigh it & let you know what it comes to.

8)

[Dedcalm]

I always thought that it was to reduce the number of moving parts. I remember reading something in RCMH some time ago regarding eccpm and 120 or 140 degree configs. 140 seems to be the best for overall use but few radio's support it.

My rappy 50 has a 9252 servo for cyclic and pitch but if this was eccpm then there would be a multiple of servo's for all movements thus less load per servo etc... might be a good thing but then more current drain as a negative...

don't know what is best but it is a good "bling" addition and different to most raptors flying.

Rob

[Raptorite]

Hi Chaps,

The main selling points for ccpm, is that there are fewer moving parts and thus less chance of slop in the controls. The other one is the sharing of the load across the three servos that would have been there on each function.

In this respect, other than a few less linkages etc. there is no reall gain in terms of weight, as the model will carry pretty much the same amount.

In terms of current draw, I would think it would be slightly less with ccpm than it would with a conventional system, as in the case of a conventional system, each of the three servos have a specific task like pitch and cyclics. So for instance if the pitch servo is working hard it will be using an expodentially high amount of current, the harder it has to work the more current it will use. Similarly the cyclic servos are the same, the harder they work, the more current they use.

Now if you have all three functions being operated and shared by the three servos together, the load on each will be less so the current draw wont be as high.

Interaction was a problem with some ccpm systems and particularly radios and servos. With good quality strong servos, interaction should be negligable.

The thing many people forget when they're setting up ccpm systems is to move the throttle stick up and down slowly and watch the swash plate, if the rise and fall is even then there wont be any problems, but if at top or bottom travel the swash skews off to one side it is just a case of tweaking the ATV's on each of the servos until the rise and fall is even. The final check is to make sure the cyclics operate in the correct sense and evenly and that's about it.

Cheers,

Pete.

[andys]

Hi Guys
I hope you dont mind me butting into your discussion, I fly with the XeroG convertion for the Raptor 30-50, the main benifits I see are as follows

the carbon frames give the Raptor increased ridgityand makes hovering and all aspects of flight more stable, and helps to hold angles and attitudes with minimal pilot interaction, also your gyro gain can be dropped, you should get a small weight saving, which will increase your power to weight ratio, the eccpm as already stated does reduce the parts count, and there for less to go wrong. There is also a new 120 degree metal swash plate which Quick UK have done for us.

The best way to setup the eccpm is with your radio set to 120 degree ccpm, linier pitch curve, and throttle/pitch stick in the center.

Next you need to make sure that all servo horns are as close to 90 degree as possible, add the servo links still making sure all is square and at 90 degrees, this should get rid of most interaction, you will have a small amount at full pitch with full forward or backwards elevator. If anyone needs help with the conversion kits please email me

there are a coulpe of videos of the kit being flown here

[ame]http://www.realraptors.co.uk/movies/RealRaptors3DRaptors.wmv[/ame]
[ame]http://www.realraptors.co.uk/movies/JeffSwartzCCPMRaptor.wmv[/ame]

hope this helps a little

Andy Saunders
Real Raptors

[Stuart]

Andy,

Now that Xero G kit is mouth watering....itching to buy one now....I noticed the conversion kits doesn't mention a swashplate withi t so I presume this is an extra cost ?

[andys]

hi Stuart
the kit comes with a conversion ring, which fits over your existing swash plate, you need to remove the balls of it and refit them onto the ring, this gives you the 120 degree eccpm setup



Andy
Real Raptors

[Stuart]

Ahhh....simple yet effective.